In the Last Post i discussed how PIM dense mode is going to work, if you dont know how PIM dense mode is going to work check this post
http://networkingmaterials.blogspot.com/2016/04/how-pim-dense-mode-is-going-to-work.html
PIM Sparse Mode:
--> PIM Sparse Mode uses Pull Method to Forward multicast traffic.
--> Only the devices which explicitly requested to receive the multicast traffic will receive the traffic.
Step1: Source or server sends multicast traffic its nearest router, The router is going to inform this to RP by using PIM Register Message.
Step2: RP upon receiving PIM Register message, it checks whether any receivers are interested to receive multicast traffic. If they are not interested then it will not forward multicast traffic to other routers.
Step3: If any receiver wants multicast traffic then it will send IGMP join message to all routers multicast address (224.0.0.2) then the router is going to send PIM join message to RP.
Step 4: Once the RP receives join message then it sends join message to the first hop router, where the source is connected to the network.
Step 5: When the last hop router receives the multicast traffic, it will create shortest path tree to the source and traffic goes directly without rendezvous point.
http://networkingmaterials.blogspot.com/2016/04/how-pim-dense-mode-is-going-to-work.html
PIM Sparse Mode:
--> PIM Sparse Mode uses Pull Method to Forward multicast traffic.
--> Only the devices which explicitly requested to receive the multicast traffic will receive the traffic.
Step1: Source or server sends multicast traffic its nearest router, The router is going to inform this to RP by using PIM Register Message.
Step2: RP upon receiving PIM Register message, it checks whether any receivers are interested to receive multicast traffic. If they are not interested then it will not forward multicast traffic to other routers.
Step3: If any receiver wants multicast traffic then it will send IGMP join message to all routers multicast address (224.0.0.2) then the router is going to send PIM join message to RP.
Step 4: Once the RP receives join message then it sends join message to the first hop router, where the source is connected to the network.
Step 5: When the last hop router receives the multicast traffic, it will create shortest path tree to the source and traffic goes directly without rendezvous point.
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